i'd definitely look into handloading, but it wouldn't be my top priority.
Factory ammo has come a long ways, and it's not like the old days where you had to hand load to obtain precision.
I shoot a lot of .4moa groups with factory hornady black. in the creedmoor their factory 143 eld-x and 147 eld-m ammo shoot excellent and consistently have low ES and SD. I know several people shooting consistent .2-.4 moa groups running factory ammo.
seeing as you bought a remington, the trigger would be probably the first thing I would replace, those x-marks are truly dreadful. I run a Timney calvin elite 2 stage personally, but trigger choice is personal preference. can't go wrong with triggertech, bix 'n andy, jewell, or timney imo.
Like stated above, a good range finder, and ballistics app. other than that i'd get out and shoot it. being that it is a factory remington, the barrel itself may not be a shooter (as was the case with mine) and is why it's currently being blueprinted and a brux barrel installed.